Thank Rick,
For the extra infomation about the file path, i was'nt using that path to delete the prefences ,am stll get confused with the way osx presents files and folders.
Anyway i delated the prefences via the file path suggested but i am still unable to connect via PPP ,i still get the message "an incorrect PPP option has been set", i really am at a loss apart from re-installing Osx10.2.
Thanks for giving it some thought anyway.
steve